Oh man. That's rough. I know, I've lost loved ones. in fact I just lost my uncle, my dad's sick... and to top it, I just had my heart ripped out, thrown on the ground, and stomped on!
But life goes on. Pain is a part of life, and with each new pain, is a new happiness. Just remember her for how wonderful she was, and remember there was nothing you could have done. She's gone, but yet she'll always be with you at the same time. I just hope you'll be able to move on, and let some other women make you just... if not happier then you ever were.
I am so sorry for your loss. But it'll all be ok, I promise. ^.^